Match List I with List II

Choose the correct answer from the options given below:

A-III, B-IV, C-II, D-I

The correct answer is option 4. A-III, B-IV, C-II, D-I

Let us break down the reasoning behind matching each polymer in List I with its corresponding category in List II:

A. Nylon 6,6: III. Fibre

Nylon 6,6 is a synthetic polymer made from hexamethylene diamine and adipic acid. It belongs to the family of polyamides. It is known for its high tensile strength, elasticity, durability, and resistance to wear and tear. Nylon 6,6 is predominantly used as a fibre in the textile industry for making fabrics, carpets, ropes, and industrial products like tire cords. Fibre  because its primary application is in making strong, durable fibres for various purposes.

B. Bakelite : IV. Thermosetting

Bakelite is a thermosetting polymer, which means it is a polymer that becomes irreversibly hard when cured. It is made from phenol and formaldehyde. It is hard, brittle, and highly resistant to heat and electricity. Once formed, it cannot be remolded. Bakelite is used to make electrical insulators, kitchenware, radio and TV casings, and other heat-resistant products. Thermosetting because it permanently sets into shape after being heated, making it suitable for high-temperature and electrical applications.

C. Polystyrene: II. Thermoplastic

Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer styrene. It is a lightweight, rigid, and transparent thermoplastic that can be easily molded into different shapes when heated and solidified upon cooling. Polystyrene is used in products like disposable cutlery, packaging materials (e.g., foam peanuts, Styrofoam), and insulation materials. Thermoplastic because it can be repeatedly melted and reshaped, making it versatile for various applications.

D. Buna-S : I. Elastomer

Buna-S (also known as Styrene-Butadiene Rubber or SBR) is a synthetic rubber made from the copolymerization of butadiene and styrene. Buna-S is a flexible, tough, and resilient material with good abrasion resistance, which makes it an ideal synthetic rubber. It is used in tire manufacturing, shoe soles, and other rubber products that require elasticity. Elastomer because it exhibits elastic properties, allowing it to stretch and return to its original shape, making it ideal for use in rubber products.